1/y^4=81

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Solution for 1/y^4=81 equation: 


D( y )

y^4 = 0

y^4 = 0

y^4 = 0

1*y^4 = 0 // : 1

y^4 = 0

y = 0

y in (-oo:0) U (0:+oo)

1/(y^4) = 81 // - 81

1/(y^4)-81 = 0

1*y^-4 = 81 // : 1

y^-4 = 81

-4 < 0

1/(y^4) = 81 // * y^4

1 = 81*y^4 // : 81

1/81 = y^4

y^4 = 1/81 // ^ 1/4

abs(y) = 1/3

y = 1/3 or y = -1/3

y in { 1/3, -1/3 }

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